SEE IT: Sam Rockwell drops F-bomb in ‘Saturday Night Live’ flub

Sam Rockwell took his role as a flustered science teacher a little too seriously on "Saturday Night Live."

The Golden Globe-winning actor dropped an f-bomb during a failed attempt to inspire two young students to learn about the density of oil and water during his first sketch as host Saturday night.

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"Just pour the oil into the water. The oil is ... Josh, you can't be f--king this stupid," Rockwell blurted out. "Sorry. Kids aren't stupid. Just say what you see. Just look at it."

Cast members Cecily Strong and Mikey Day, portraying two young children during the "Science Room" sketch, exaggerated their shock at hearing the profane slip and continued with the scene.

It's unclear if Rockwell intended to use the f-word, but it couldn't be heard in the version of the sketch that was uploaded to YouTube late Saturday.

Actor Sam Rockwell slipped an F-bomb into his first "Saturday Night Live" sketch of the night. (NBC)

In another sketch, Kate McKinnon's portrayal of Rockwell's "Three Billboards Outside Ebbing, Missouri," castmate, Frances McDormand, responded to the Golden Globes decision to bleep a part of her acceptance speech.

"It happens. I'm not cursing. It's just the tone of my voice," McKinnon said as the film's star.

Rockwell won the best supporting actor award for his role in Martin McDonagh's film.

The topic of profanity continued with "Weekend Update" anchors Colin Jost and Michael Che tackling President Trump's racist insult at a White House immigration meeting.

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Jost did not shy away from quoting the President, in what appeared to be an act of defiance toward the show's network, NBC.

"Trump attacked protections for immigrants from African countries, which he called s-holes," Jost said. "That's what NBC asked us to say, by the way. S-holes. Even though the President can say shithole. Oops.

"I feel bad for parents with young children. Every word you tell your kid not to say, they can be like, 'Well, the President gets to say it.' "